5. A car accelerates constantly from an initial speed of 20 miles per hour to 60 miles per hour at a distance of 300 ft. (a) Calculate the acceleration of the car, in ft/s?. (b) Determine how long it takes the car to reach the 60 miles per hour speed. Answer: (a) acceleration ft/s2 Answer: (b) time sec

5. A car accelerates constantly from an initial speed of 20 miles per hour to 60 miles per hour at a distance of 300 ft. (a) Calculate the acceleration of the car, in ft/s?. (b) Determine how long it takes the car to reach the 60 miles per hour speed. Answer: (a) acceleration ft/s2 Answer: (b) time sec

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter2: Kinematics

Section: Chapter Questions

Problem 34PE: In World War II, there were several reported cases of airmen who jumped from their flaming airplanes...

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In World War II, there were several reported cases of airmen who jumped from their flaming airplanes with no parachute to escape certain death. Some fell about 20,000 feet (6000 m), and some of them survived, with few life-threatening injuries. For these lucky pilots, the tree branches and snow drifts on the ground allowed their deceleration to be relatively small. If we assume that a pilot's speed upon impact was 123 mph (54 m/s), then what was his deceleration? Assume that the trees and snow stopped him over a distance of 3.0 m.
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